I have here (the beginnings) of a series of tutorials that will cover a few of the features and techniques that are found within an image editor like Photoshop. I thought that it will be easier to cover one technique at a time so that people can understand or improve their knowledge on a particular area.
Hopefully these will be useful.
Tutorial List:
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If you are interested in a particular technique, let me know and I will have a look at possibly making a tut for it.